A window box is a simple way to garden on a small scale. With easy access and low maintenance, a window box is an ideal candidate for growing certain vegetables without the fuss of digging an entire vegetable garden. By selecting vegetables such as onions, garlic, bush beans, dwarf peas, carrots, lettuce, spinach and radishes, you can have fresh vegetables straight from the window to the kitchen. To grow vegetables in a window box, just be sure you have adequate sunlight and the window in a location you can easily get to with regularity.
Create drainage holes in the base of your window box by drilling one-quarter inch holes every 6 to 8 inches. Fill the bottom of the box with an inch of pea gravel, covering the holes partially as well.
Add an equal mixture of potting soil and compost to the box to fill it to within 1 inch from the top edge.
Plan how you want your window box to be planted and which vegetables you want to use. You can use a box for a single type of vegetable such as lettuce, or mix multiple types of plants together in the same box, such as spinach, carrots and peas.
Plant your seeds or seedlings after the last spring frost according to their depth and spacing needs. Water the box to thoroughly moisten the soil and keep the soil moist for the first two to three weeks.
Continue to supply water for your young plants as they grow. Depending on what plants you have chosen to grow, harvest from them as needed such as picking peas or cutting a few leaves of spinach when they are ready.
Treat your plants with a pesticide which is safe for edible plants if you notice any insects starting to invade your window box.